William did not sleep.
He lay on the bed with one hand resting on his newly regenerated leg, afraid that if he moved too much, it might disappear. The room was dark except for the weak light leaking through the seams in the metal walls. Beyond them, pipes hissed as pressure shifted through the station, and loose sheets of steel rattled whenever the Spine passed beneath their home. He had lived beside those noises for years. Usually, they were only noises. Tonight, every scrape and hiss seemed to reach him separately, clear enough to make sleep impossible.
Maria lay beside him, turned away. Crowe and Archie were asleep in the other room, sharing the same thin mattress they had outgrown months ago. William could hear them breathing through the wall. He had never paid much attention to the sound before. There had always been too many other things to worry about: the next extraction, the next meal, the next time one of his children woke hungry and asked whether there was anything left to eat.
Now he could hear every breath.
He turned towards Maria. Her breathing was slower than the boys', with a slight catch whenever she exhaled. He knew that catch. She had developed it during the worst of the shortages, when the air was thin and she spent too much of the night coughing. He had told her to get more rest, but rest was a luxury in a home where someone always needed something repaired, cleaned, cooked, or carried.
He wondered how long she had been breathing like that.
Then he wondered why he had never noticed.
The thought made him uncomfortable. He pressed his palm against his leg, feeling the warmth beneath the skin. Perhaps the Azo had sharpened his hearing. Perhaps that was another side effect, like the veins beneath his skin or the strange pulse he had felt earlier. The dealer had promised faster regeneration. He hadn't promised anything else, but men selling illegal substances were hardly known for telling the whole truth.
William would have to be careful.
He had no intention of ending up like the man in the alley. Whatever had happened to that Dweller, William had seen enough to know that the VigilNet did not waste time trying to save people once they became a problem. They had killed the man, repaired the damage, and carried on as if the whole affair were no more than a faulty pipe being replaced. If William started showing the same symptoms, there would be no one to protect his family from the consequences.
He could not afford that.
He sat up and swung his legs over the edge of the bed. The movement still felt strange. For eleven years, he had learned to stand, sit, and climb around the absence of his left leg. Now the limb was back, but the rest of his body had not quite caught up. He planted his foot on the floor and waited until he felt steady before standing.
The leg held.
William let out a slow breath. He crossed the room, opened the food compartment, and looked at what remained. Three kilograms of FleshFoods, fifteen Stabiliron pills, and a family of four. He counted the packages again, although he already knew the numbers. Then he closed the compartment.
He had been doing this for years. Count what remained. Work out how long it would last. Decide who could go without what. Find a way to make the numbers work.
This time, he had a new option.
The dealer's vial had regenerated his leg in minutes. If he could make the process happen again, he might not have to wait for the next extraction. He could sell the new flesh, buy more pills, and keep the family fed. Perhaps he could even save enough to move them somewhere quieter, away from the Spine tracks and the choking air. It was a foolish thought, perhaps, but he had spent years surviving on possibilities no one else considered worth pursuing.
He had not come this far by turning away from a chance because it frightened him.
William returned to bed. Before lying down, he checked his leg once more, running his fingers over the skin where the stump had been. It felt ordinary. Warm, a little tender, but ordinary. He pressed harder and felt a faint twitch beneath the muscle.
He stopped.
The twitch came again.
William pulled his hand away and waited. Nothing followed. After a moment, he rubbed his leg through the blanket, as if that might settle it.
"Just healing," he whispered.
He had seen stranger things happen to bodies in the Limb Market. A man could lose half his foot during extraction and walk again after a few weeks of regeneration. Some grew back crooked. Some took longer than expected. The dealers had a dozen explanations for every irregularity, and most of them were designed to keep people from asking for their money back.
A twitch was nothing. He had bigger problems.
In the morning, William discovered that his new leg was worth more than he had expected. He could stand without crutches, walk without stopping, and carry a full container without having to shift its weight onto his good side. His first instinct was to go straight to the Limb Market and ask how soon he could sell again. The second was to remember the corrupted man, his glowing veins and the metal crushing his body from the inside.
William stayed home.
He spent the morning doing small jobs around the apartment instead. He tightened the door hinges, repaired the loose fastening on the food compartment, and moved a shelf that had been threatening to fall for weeks. The work was ordinary, but it felt different when he could do it without pain. He no longer had to sit down halfway through a repair. He no longer had to ask Crowe to carry things that a father ought to have been able to carry himself.
When Archie knocked over a container of tools, William caught it before it struck the floor.
The boy stared at him.
"How'd you do that?"
"Was watching."
"You weren't looking."
William glanced at the container in his hand. He hadn't been looking directly at it. He had heard the first scrape of metal against the shelf and moved before it fell. That was all. He had spent years learning to react quickly around heavy machinery, and perhaps the Azo had made him a little faster.
"Don't go knocking things over to find out," he told Archie, setting the container down.
Archie grinned and ran off.
William smiled after him. For a moment, he felt something he had not felt in a long time: useful. Not because his body could be cut apart and weighed, but because he could do things for his family without needing someone else to help him.
That afternoon, he tried to understand what had happened to him. He had no proper equipment, no medical training, and no idea what the dealer had put into the vial. He used what he had. He pressed his thumb into the skin of his regenerated leg, flexed the muscles, and watched for changes. When a small cut opened across his palm while he repaired the door, he held it under the kitchen light and waited for it to stop bleeding.
It took longer than he expected.
William was beginning to grow impatient when he remembered the warmth he had felt during the regeneration. He pressed his thumb against the cut and concentrated on the sting. He did not know what else to do. He simply wanted it to stop hurting.
The bleeding slowed.
He blinked and looked closer. The edges of the cut seemed to draw together, though so gradually that he could not be certain he had seen it happen. He held his hand still until the wound closed into a thin red line.
William rubbed the mark with his thumb.
"Well, I'll be damned."
He tried it again with another small cut. This time, he watched more carefully, keeping his attention on the wound instead of the pain. The result was much the same. The cut closed faster than it should have.
He sat at the kitchen table, staring at his hand.
He did not know why it had worked. Perhaps the Azo had done it on its own. Perhaps the warmth in his body had something to do with it. Perhaps he had simply been lucky the first time. He had no way to tell, and the uncertainty bothered him.
But he had seen it happen twice.
William fetched the notebook he used for keeping track of extraction dates and household expenses. On a clean patch of metal, he wrote down what he had done. The words were clumsy, and he scratched out half of them before settling on a simple note: Small wound closed faster when I concentrated on it.
He stared at the sentence. It did not tell him much, but it was something he could try again.
He was not looking for secrets or power. He wanted to know whether he could make his leg regenerate on demand, whether he could heal quickly enough to sell again, and whether the substance would keep working if he used it more than once. Those were the questions that mattered. Everything else could wait.
That evening, Maria found him examining his palm.
"What happened?"
"Cut myself fixing the door."
She took his hand and turned it beneath the light. "Where's the cut?"
"Closed up."
"Already?"
William shrugged. "Seems to heal faster now."
Maria did not let go of his hand. Her eyes moved from his palm to his leg, then back to his face.
"William, what did you take?"
He felt his stomach tighten. He had hoped to avoid this conversation until he had a better answer. "Something to help the regeneration."
"What something?"
"Azo."
Maria's grip loosened.
For a moment, neither spoke. From the next room came the sound of Archie playing with a broken toy, making little engine noises under his breath. William looked towards the doorway. He did not want to have this conversation where the boys could hear.
"It was cheap," he said quietly. "And it worked."
"You saw what happened to that man."
"I saw what happened to him after he'd already gone wrong. I don't know how much he took, or what else he'd been using."
"Neither do you."
"I know it grew my leg back."
Maria released his hand. "And what happens if it takes something else?"
William looked down at his palm. The thin red mark had almost disappeared.
"What happens if I do nothing?" he asked. "We have fifteen pills. Fifteen, Maria. We need them to keep our heads straight, and I need to regenerate before the next extraction. If I can't work, we lose the food. If I can't sell, we lose the pills. Tell me what I'm supposed to do instead."
Maria's face tightened. He knew she had no answer. That was the worst part. She could tell him to stop, but she could not tell him how to feed the children if he did. She could be afraid of the Azo, but she could not make the fear pay their rent.
"I don't want to lose you," she said.
William looked at her. He wanted to tell her that she wouldn't. He wanted to promise that he knew what he was doing, that he would be careful, that everything would be fine. But he had made too many promises in his life and watched too many of them fall apart.
So he took her hand instead.
"I'm trying to keep us going."
Maria looked at their joined hands, and he felt her fingers tremble.
He told himself she would understand once things improved.
Over the following days, William began to notice small changes. He could hear the Spine approaching before the warning alarms sounded. He could feel the vibration of a loose panel through the soles of his feet. Once, while carrying a crate along the outer walkway, he stopped and stepped aside just before a maintenance cart came hurtling around the corner. The worker pushing it shouted at him to watch where he was going, but William barely heard him. He was too busy wondering how he had known to move.
It was not that he could see the future. He knew that much. He had simply noticed something before the others did: a distant scrape, a shift in the floor, a sound buried beneath the machinery. He had spent years in the Spine, and he knew its moods better than most. Perhaps the Azo had made him more sensitive to things he had previously ignored.
Still, he could not deny that it was useful.
He began using it whenever he could. He chose routes with fewer crowds, avoided platforms where the metal sounded weak, and took small jobs other Dwellers considered too risky. Each time he avoided an accident, he felt a little more certain that he could trust what he sensed. Each time he earned a few extra Stabiliron pills or brought home another package of FleshFoods, the risk seemed more worthwhile.
Then, one morning, he heard a sharp creak above the walkway where Crowe was standing.
William moved before he thought. He grabbed his son by the collar and pulled him backwards. Crowe stumbled into him, startled and angry, just as a sheet of rusted metal tore free from the ceiling and crashed onto the floor.
The impact shook the walkway.
Crowe stared at the fallen sheet, then up at his father.
"How did you know?"
William's heart was still racing. He looked at the metal, at the torn fastenings, at the place where his son had been standing. He had heard the creak, certainly. But he had also felt something in the floor, a small change in the vibration that made him move before he could explain why.
"I heard it coming loose," he said.
Crowe looked impressed. "You saved me."
William swallowed. He had spent years being the father who needed help carrying things, the man who had to be careful on stairs, the one whose children learned not to ask for too much. Now Crowe was looking at him as though he could keep the world from hurting him.
William placed a hand on his son's head.
"Just be careful, all right?"
Crowe nodded.
William watched him run back inside, then looked once more at the fallen metal. He did not know how he had reacted so quickly. He only knew that he had been right to do so, and that his son was safe.
For the rest of the day, he carried that feeling with him.
He was still frightened of what the Azo might do. He had not forgotten the corrupted man in the alley, or the way the VigilNet had killed him without hesitation. But fear was easier to live with when there was something good on the other side of it. William had a working leg, a little more money, and a chance to keep his family fed. If the Azo had given him a way to survive, then he would use it. He would be careful. He would stop if he saw anything truly wrong.
He repeated that promise to himself as he walked home.
By the time he reached the apartment, he had already begun to forget how frightened he had been.
Maria was preparing the evening meal. Crowe was telling Archie about the falling metal, exaggerating the story with every telling. William listened from the doorway, letting himself enjoy the sound of his sons laughing. For a little while, the home felt almost normal.
Then Maria looked at him.
She did not smile.
"You should stop," she said quietly.
William's happiness faded. "Stop what?"
"Whatever you're doing to yourself."
"I'm not doing anything."
"William."
"I am working. I'm bringing food home. I'm keeping the boys safe. What exactly do you want me to stop?"
Maria glanced at his leg. "I want you to stop before something happens that we can't take back."
He looked at her for a long moment. He could see the worry in her face, but he could not understand why she was treating the first good thing to happen to them in years as though it were a disaster waiting to happen. He had not become one of the creatures from the Limb Market. He was still able to think, to work, to care for his family. His leg had healed. His cuts closed faster. He could hear dangers before they arrived.
He was doing better, not worse.
"You don't know what you're asking me to give up," he said.
Maria's expression softened. "I know exactly what you're risking."
"No, you don't."
The words came out more harshly than he intended. He saw her flinch and immediately regretted it. He wanted to take them back, to explain that he was tired and scared and trying to do the best he could. But he could not find the right words, and the silence between them grew.
William turned away first.
That night, he opened his notebook and added another line beneath his earlier observations. He did not write about the strange pulse beneath his skin, or the unfamiliar hunger that sometimes came and went without warning. He wrote about the falling metal, about how quickly he had moved, and about the fact that Crowe had been safe.
He looked at the page for a while, then added a final sentence.
Pay attention. It might save them.
He closed the notebook and hid it beneath the bed.
William did not think he was becoming powerful. He thought he was getting better at surviving. He had learned to make use of what little he had, and he had no intention of giving up an advantage while his family still needed him.
The next morning, when he woke, the dark veins beneath his skin had spread a little farther up his thigh.
He noticed them while dressing.
He stared for a moment, then pulled his trousers over them.
There was work to do.